code: def test_invert_empty_not_input(self):
      # GH#51032
      df = pd.DataFrame()
      result = ~df
      tm.assert_frame_equal(df, result)
      assert df is not result
  
file_path: pandas/pandas/tests/frame/test_unary.py
imports: from decimal import Decimal
  import numpy
  import pytest
  from pandas.compat.numpy import np_version_gte1p25
  import pandas
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestDataFrameUnaryOperators obj's underlying member method code with example usage: obj.test_invert_empty_not_input() without return types